Air valve housing with tire pressure indicator

Abstract

An inner cylinder has a reduced diameter portion and a proximally disposed transverse aperture. An outer cylinder has a distally disposed transverse hole. The inner and outer cylinders are coaxially disposed and sealingly engaged distally, thereby forming a cylindrical space between them. A cylindrical piston within the cylindrical space is slidably urged proximally by a coil spring. A cylindrical seal separates the space between a higher pressure proximal zone and a lower pressure distal zone, the seal moving with the piston. A mounting cylinder is sealingly engaged with the outer cylinder and terminates proximally with an internal thread for engaging a typical valve stem or a wheel mount for mounting the apparatus on an automotive wheel in place of a typical valve stem.

1 . A tire pressure indicating apparatus with opposing proximal and distal ends comprising: an inner cylinder having a reduced diameter portion and a proximally disposed transverse aperture; an outer cylinder having a distally disposed transverse hole; the inner and outer cylinders coaxially disposed and sealingly engaged distally, thereby forming a cylindrical space therebetween; a cylindrical piston within the cylindrical space slidably urged proximally by a coil spring; a cylindrical seal separating the space between a higher pressure proximal zone and a lower pressure distal zone, the seal moving with the piston, and a mounting cylinder air-tight sealingly engaged with the outer cylinder and terminating proximally with a tire air valve mounting means for mounting the apparatus on a tire air valve.  
   
   
       2 . The apparatus of  claim 1  wherein the outer cylinder provides a viewing means positioned for observing the piston.  
   
   
       3 . The apparatus of  claim 2  wherein the piston is marked to indicate a tire pressure condition.  
   
   
       4 . The apparatus of  claim 1  further comprising a threaded nipple distally terminating the inner cylinder.  
   
   
       5 . The apparatus of  claim 4  wherein the threaded nipple further comprises an air inlet valve.  
   
   
       6 . A tire pressure indicating apparatus with opposing proximal and distal ends comprising: an inner cylinder having a reduced diameter portion and a proximally disposed transverse aperture; an outer cylinder having a distally disposed transverse hole; the inner and outer cylinders coaxially disposed and sealingly engaged distally, thereby forming a cylindrical space therebetween; a cylindrical piston within the cylindrical space slidably urged proximally by a coil spring; a cylindrical seal separating the space between a higher pressure proximal zone and a lower pressure distal zone, the seal movable with the piston; the apparatus terminating proximally with a tire wheel mounting means for mounting the apparatus on a tire wheel.  
   
   
       7 . The apparatus of  claim 6  wherein the outer cylinder provides a viewing means positioned for observing the piston.  
   
   
       8 . The apparatus of  claim 7  wherein the piston is marked to indicate a tire pressure condition.  
   
   
       9 . The apparatus of  claim 6  further comprising a threaded nipple distally terminating the inner cylinder.  
   
   
       10 . The apparatus of  claim 9  wherein the threaded nipple further comprises an air inlet valve.  
   
   
       11 . The apparatus of  claim 6  wherein the tire wheel mounting means comprises a grommet, a cupped washer and a compression fastener.